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[問題] x² + 2xy + y² + 5x + ay + b > 0
Author:
羅驥韡 (Pegasus Roe)
Topic:
Quadratic Functions
若對於任意實數 x, y,x² + 2xy + y² + 5x + ay + b > 0 恆成立,求 a, b 的條件?
GeoGebra
答:a = 5, b > 25/4(提示:利用判別式)
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